The kth great number

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others) Total Submission(s): 12301    Accepted Submission(s): 4816 Problem Description Xiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a number, or ask Xiao Bao what the kth great number is. Because the number written by Xiao Ming is too much, Xiao Bao is feeling giddy. Now, try to help Xiao Bao.   Input There are several test cases. For each test case, the first line of input contains two positive integer n, k. Then n lines follow. If Xiao Ming choose to write down a number, there will be an " I" followed by a number that Xiao Ming will write down. If Xiao Ming choose to ask Xiao Bao, there will be a "Q", then you need to output the kth great number.   Output The output consists of one integer representing the largest number of islands that all lie on one line.   Sample Input 8 3 I 1 I 2 I 3 Q I 5 Q I 4 Q   Sample Output 1 2 3 Hint Xiao Ming won't ask Xiao Bao the kth great number when the number of the written number is smaller than k. (1=<k<=n<=1000000).   Source The 36th ACM/ICPC Asia Regional Dalian Site —— Online Contest   Recommend lcy   |   We have carefully selected several similar problems for you:   4003  4007  4004  4008  4005 

 

这道题使用multiset来做，维持大小即可。

#include<cstdio> #include<iostream> #include<algorithm> #include<cstring> #include<math.h> #include<set> #include<queue> using namespace std; multiset<int> q; int main() {     int n,k;     while(scanf("%d%d",&n,&k)!=EOF)     {         q.clear();         for(int i=1;i<=n;i++)         {             char c;             cin>>c;             if(c=='I')             {                 int u;                 cin>>u;                 q.insert(u);                 if(q.size()>k)                 {                     q.erase(q.begin());                 }             }             else             {                 cout<<*q.begin()<<endl;             }         }     } }